Amazingly, I have just discovered that if you put your hands up to your eyes and curl them to make 'binoculars',
locking in can be much easier and quicker - AFTER you click on this photo to enlarge it on most desktop computers!

You might also be able to view these without 3D glasses if you move your eyes inwards and focus on two of the same
points until they become one. Then, move back about one metre or more. If you 'lose' the 3D, start again close up.

Press the F11 button on Windows computers to get a Full Screen - and move the mouse arrow to one side!